Preliminary study on development characteristics of planation surface in Liaodong Peninsula
Jin Shu-Chen1, Li Yong-Hua2, Wei Dong-Lan2, Li Xin-Rui2, Liu Da-Qi2
1 College of Resources,Environment and Tourism,Capital Normal University,Beijing 100048,China; 2 School of Geography,Liaoning Normal University,Liaoning Dalian 116029,China
Abstract：Planation surface is one that is associated with long-term stable tectonic environment of large scale landscape. The planation surface with the weathering crust as a whole to study is the main stream of modern planation surface research. The red weathering crust mainly is outcropped in the east and west of Liaodong Peninsula,and its thickness is around 4 m. In order to explore the properties,environment and development characteristics of the planation surface in Liaodong Peninsula,chemical elements and particle size characteristics of red weathering crust in this area were studied. The test results showed that the average value of CIA of the red weathering crust in the study area is 82.70,the average value of ba((Na2O+K2O+CaO+MgO)/Al2O3)is 0.39,the average value of S/A(SiO2/Al2O3)is 4.86,and the average value of clay content is 8.31%. Compared with the red weathering crust of the karst area in the south of China,it has the characteristics of low leaching rate of salt base,low aluminization degree and weak viscosification. According to the regional geomorphologic features,the development of red weathering crust in the study area mainly went through four stages: (1)karst process was carried out in the whole rock mass above the base level of ancient erosion,and the geomorphologic fluctuation gradually increased;(2)geomorphologic fluctuation reached the maximum,and covered karst and gray weathering crust began to develop;(3)karst double-layer planation surface basically formed;(4)the development of gray weathering crust nearly stopped. With the tectonic movement,the gray weathering crust,which was originally located below the base level of ancient erosion,was all elevated above the base level of modern erosion to form red weathering crust. Therefore,the planation surface in the study area is ancient planation surface,and the development stage is lateralization stage. The results can provide a preliminary basis for revealing the neotectonic movement and sea level change in the Liaodong Peninsula from the Neogene to present.
Jin Shu-Chen,Li Yong-Hua,Wei Dong-Lan et al. Preliminary study on development characteristics of planation surface in Liaodong Peninsula[J]. JOPC, 2020, 22(4): 715-726.
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